|
| year | production | change |
| 1984 | 7.21 | NA |
| 1985 | 9.73 | 34.97 % |
| 1986 | 6.43 | -33.90 % |
| 1987 | 8.48 | 31.86 % |
| 1988 | 10.81 | 27.43 % |
| 1989 | 7.49 | -30.73 % |
| 1990 | 3.56 | -52.43 % |
| 1991 | 3.39 | -4.85 % |
| 1992 | 3.23 | -4.63 % |
| 1993 | 3.59 | 11.04 % |
| 1994 | 2.49 | -30.69 % |
| 1995 | 1.90 | -23.46 % |
| 1996 | 2.15 | 13.07 % |
| 1997 | 1.64 | -23.78 % |
| 1998 | 1.88 | 14.36 % |
| 1999 | .98 | -48.03 % |
| 2000 | .69 | -28.85 % |
| 2001 | .67 | -3.28 % |
| 2002 | .95 | 41.63 % |
| 2003 | 1.73 | 82.13 % |
| 2004 | 1.38 | -20.31 % |
| 2005 | .52 | -62.07 % |
| 2006 | .69 | 32.46 % |
| 2007 | 1.54 | 121.74 % |
| 2008 | .28 | -81.51 % |
| 2009 | .55 | 91.87 % |
| 2010 | .84 | 54.77 % |
|
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